Results 151 to 160 of about 158,096 (183)

Do queens select sperm?

Trends in Ecology & Evolution, 2003
In their recent Research Update in TREE discussing the genetic caste determination in certain hybrid populations of the harvester ant Pogonomyrmex barbatus [1xGenetic determination of caste in harvester ants. Ashe, A. and Oldroyd, B. Trends Ecol. Evol.
David J. Hosken, Scott Pitnick
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Intracytoplasmic Morphology-Selected Sperm Injection

2012
Approximately 40% of sterility in couples can be attributed to male subfertility and intracytoplasmic sperm injection (ICSI) has become a powerful tool in assisted reproduction to overcome male infertility. Intracytoplasmic morphologically selected sperm injection (IMSI) is an advanced and sophisticated method of ICSI, where prior to sperm injection ...
Luke, Simon, Aaron, Wilcox, Douglas T, Carrell   +2 more
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Sperm Preparation Techniques and Advanced Sperm Selection for Intracytoplasmic Sperm Injection

2023
Despite years of research, numerous questions persist regarding the most effective sperm selection techniques. Frequently, new methods have gained popularity without thorough, extensive trials demonstrating their benefits. It is evident that there is no universally applicable solution, and it remains uncertain whether any of those techniques are ...
Ozkavukcu, Sinan, Hughes, George, Barratt, Christopher L.R.   +2 more
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Sperm Processing and Selection

2020
Assisted reproductive technology (ART) use sperm sorting methods to select viable sperm from semen samples. Conventional sperm sorting techniques currently use swim-up and density gradient centrifugation. These methods use multiple centrifugation steps, which have been shown to generate reactive oxygen species (ROS) that decrease DNA integrity and ...
Rakesh Sharma, Ashok Agarwal
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Sperm-specific natural selection

Science, 2021
Sperm Genomics Sperm cells are genetically haploid, but because of the cytoplasmic bridges that link cells, they can be transcriptionally diploid. However, some gene transcripts are not shared. Bhutani et al. sequenced single sperm from mice, cattle, and macaques to determine the extent of distortion in the expression of these putatively selfish ...
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Sperm Selection Capacity of Cervical Mucus

Archives of Andrology, 1984
Seventeen couples who attended the Infertility Clinic for routine fertility investigations were used in the study. Complete morphological examinations were performed on the ejaculates and cervical mucus samples following coitus in order to determine the morphological selective capacity of the mucus.
E, Pretorius, D R, Franken, J, De Wet, S, Grobler   +3 more
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Microfluidics for sperm analysis and selection

Nature Reviews Urology, 2017
Infertility is a growing global health issue with far-reaching socioeconomic implications. A downward trend in male fertility highlights the acute need for affordable and accessible diagnosis and treatment. Assisted reproductive technologies are effective in treating male infertility, but their success rate has plateaued at ∼33% per cycle.
Reza, Nosrati, Percival J, Graham, Biao, Zhang, Jason, Riordon, Alexander, Lagunov, Thomas G, Hannam, Carlos, Escobedo, Keith, Jarvi, David, Sinton   +8 more
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Microfluidics for Sperm Selection

2014
Traditional methods for sperm selection such as swim-up and isopycnic (density gradient) centrifugation involve prolonged periods of incubation and/or serial centrifugations. Prolonged incubation of sperm with other cellular components of semen and serial centrifugation expose motile sperm to reactive oxygen species.
Gary D. Smith, André Monteiro da Rocha, Laura Keller   +2 more
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Sperm Processing and Selection

2012
The application of assisted reproductive techniques (ART) has provided help to many men seeking to father a child, although the current success rates of these procedures remain suboptimal. Since raw semen cannot be used in most ART, a workup of the ejaculate is needed to extract those sperm that are capable to fertilize the egg.
Sonja Grunewald, Uwe Paasch
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Non-apoptotic Sperm Selection

2014
Apoptosis plays an important role in the pathogenesis of male infertility. Failure of fertilization in assisted reproduction (ART) despite the use of morphologically normal and motile spermatozoa may be due to an ongoing process of apoptosis. Therefore, the use of apoptotic spermatozoa may be one of the reasons behind the suboptimal success rates in ...
Tamer Said, Reda Z. Mahfouz, Iryna Kuznyetsova, Alfonso P. Del Valle   +3 more
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